Auto Meter Tach?
 

I bouht a 5" Auto Meter tach but don't have a clue how to hook it up. The red is power, Black is ground, white is for the light, green wire goes to the negative lead off the coil. There is no coil. Can anyone help me?
Thanks in advance.

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Black 99 GT Bone stock
14.53 @ 104 (using a G-tech pro)